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\ V Letters Patent No. 79,504, dated June 30, 1868.

IMPROVED METAL-.IE'OUNDERS BLAGKING.

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TO ALL WHOM IT MAY: CONCERN:

In the process of refining petroleum, parading coal, shale, and othermineral oils andtors, sucli as asphalte and bitumen, by distillation,and after nearly all, or all, the liquid and gaseous portions orproducts have been driven off, there is left in the still a pasty or,dry residue or coke, which consists principally if not entirelyiofcarbon. Imake metal-founders blocking of the said residneor coke, andthereby utilize it. This metal-founders blackingI propose to employinthe place of the unctuous powdery substance known as blocking, andused for coating theinnersurfacesof moulds formed to receive liquid ironor other metal, for mixingxvith loam, making black-wash, and for otherfoundry purposes. a a

My mode of treating or preparing the above-mentioned residue or cokeysoas to render it uniformly suitable for the purpose above mentioned,con'sists of reducing it to a state of fine mechanical division orpowder, by grinding, sifting, or blowing, but I would have it understoodthat I prefer the grinding process, employing horizontal bnrrstones,edge runners, or rolls.

With some residues or cokes, and with nearly all those from mineraloils, subjected to the distillatoiy pro:

cess to the ordinary extent, I hare't'ound it necessary, before reducingthem to powder, to subject them to heat or calcination before grindingor-otherwise reducing them to fine powder. In effecting this I place thesaid residues or col (e in a closed oven or retort'-a retort such as isused in the manufacture of coal-gas answers well the material beingoperated on to a dull red heat, for a period of from one to four hours,according to circnmv stances. Those residues or cokes which leave thestill in the dryest condition require oalcination for the shortestperiod, and vice versa; in ordinary practice two honrs will besufficient. After calcination, I'withdraw the material, preferably intovessels from whichair is excluded. Withdrawal from the retort or eveninto vessels open to or into the air, I would have it understood, doesbut very little injury.

,Having now described the nature of my said invention, andparticularized the mode of carrying the same into beneficial effect, insuch terms that others acquainted with the mannfacturelwill be enabledto carry the invention into use, Iwould have it understood that what I'claim, is-- Utilizing the residue or coke left from mineral oils otherlike substances in stills,'after the .distillatory process, by employingit for metal-founders blacking, substantially in the mannerhere-inbefore described.

In testimony whereof, I have hereunto set my name in. presence of twosubscribing witnesses.

JOHN OARRINGTON SELLARS.

' Witnesses:

Joan T. KING, E. J. Casement.-

